fractional distillationseperates the petroleum into different groups of simpler mixture.the process does not result in the seperation of each substance in petroleum.
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An organic compound X has the molecular formula C3H4F2. which of the following statement conerning X is correct? A.X has at least four possible structures. B.X must be a saturated compound. C.X turns acidified potassium dichromate solution from orange to green. D.X can be used to make a thermosetting plastic by addition polymeriation.
同埋呢..如果加左1種soluble salt in excess to a solution. 咁excess果d salt會溶落個solution定係唔溶落solution到...?? 係唔係insoluble先會remain 係個beaker度架!? 小霞的fans 發表於 7/4/2010 12:19 PM